paper container

Abstract

In the paper container 95 of this disclosure, an upper seal portion 53 is provided to seal its top portion 71. The present invention provides a paper container 95 that is easy for the user to cut off when removing the upper seal portion 53 in order to remove the contents. [Solution] A paper container 95 is formed by assembling a front blank plate 10b and a back blank plate 10a, both made of laminated sheets 78 including a paper base material layer 782, and comprises: an upper seal portion 53 provided laterally on the upper edge 21 of the upper overlap plate 34 and the top side plate 41; two or more upper edge anti-slip recesses 772 provided on the upper edge of the upper overlap plate 34 and / or the upper edge of the top side plate 41; and an opening indicator line 51 that starts at the upper edge anti-slip recess 772 or near the upper edge anti-slip recess 772 and ends at the side edge of the top side plate 41.

Description

Technical Field

[0001] The present disclosure relates to a paper container, and particularly to a paper container having a three-dimensional shape and self-standing property, and more particularly to a paper container with an opening at the top that is easily opened initially in the field of paper containers.

Background Art

[0002] Conventionally, as a paper container with a chuck, a technique such as that of Patent Document 1 has been disclosed. That is, a chuck tape 861 is provided on the upper part of a rectangular parallelepiped paper container along an easy-opening processing line 851 for initial opening. When taking out the contents, first, the easy-opening processing line 851 is cut. Then, the chuck tape 861 is opened and the contents are taken out, and when the taking out of the contents is finished, the chuck tape 861 can be closed.

[0003] By the above technique, it is possible to protect the contents and prevent the contents from spilling when the paper container is overturned. Also, since it is a paper container, it is easy to reduce the volume of the container after consuming the contents and to discard it. FIG. 18 shows a blank plate 81 used for manufacturing a conventional chuck-equipped paper container 80, FIG. 19 shows a perspective view of the conventional chuck-equipped paper container 80, and FIG. 20 shows a perspective view in a state where the top is opened.

[0004] In addition, unless otherwise specified hereinafter, referring to FIG. 16, with the outer wall panel 831b of the front side as a reference, the front side, back side, left side, right side, top side, and bottom side of the chuck-equipped paper container 80 are shown.

[0005] Also, in order to distinguish from the present disclosure, the reference numerals used when explaining the conventional technology are in the 80s or 800s. Also, the subscript a of the reference numeral indicates an element on the back side of the chuck-equipped paper container 80, and the subscript b indicates an element on the front side. For an element having both a and b of the subscript, the reference numeral without a subscript may include both a and b.

[0006] In the resealable paper container 80 described in Patent Document 1, when the top 871 is opened and the contents are removed, first the top protrusion 874 is removed from the body 872, then the easy-open processing line 851 is cut, and then the male and female fitting parts of the zipper tape 861 are separated, opening the removal opening 856 (see Figure 20). The contents are then removed through the removal opening 856.

[0007] The easy-opening line 851 for cutting the resealable paper container has sections where the paper base layer is thinner to facilitate cutting, such as discontinuous holes that go all the way through or half-cuts that do not go all the way through. Here, the above processing is called easy-opening processing. The easy-open processing increases the number of processing steps, thus increasing costs. Furthermore, there was a risk that the easy-open processing line 851 might be accidentally bent during the assembly of the resealable paper container. The easy-open processing line 851 is a weak point in the blank plate 81, and if it is accidentally bent, it becomes difficult to manufacture the resealable paper container 80, potentially resulting in the blank plate 81 becoming a defective product and being discarded. Although prior art 1 describes a paper container with a zipper 80, the same applies to an easy-open processing line 851 for a paper container that does not have a zipper tape. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2005-178833 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] This disclosure was made to solve the above-mentioned problems, and in a paper container, an opening means is used as a means of initial opening instead of an easy-opening line. This opening means reduces the processing steps of the easy-opening process. Furthermore, it reduces the reduction in the barrier properties of the zippered paper container 80 that occurs when the laminated sheets of the blank plate are penetrated during the processing of the easy-opening line. In addition, it provides a paper container that reduces the number of failures during the manufacturing of the paper container and reduces the loss of blank plates. [Means for solving the problem]

[0010] The above-mentioned problems can be solved by the following embodiments of this disclosure. In other words, the paper container 95 of this disclosure is In a paper container 95 into which a blank plate 10 consisting of a laminated sheet 78 including a paper base material layer 782 is assembled, The blank plate 10 includes at least a front blank plate 10b and a back blank plate 10a. The top of the paper container 95 is a top section 71 consisting of an upper overlapping plate 34 formed by overlapping and joining the front blank plate 10b and the back blank plate 10a, and a top plate 33 connected to the bottom of the upper overlapping plate 34. The top side panels 41 are connected to both the left and right sides of the upper overlapping plate 34, The top portion 71 has top portion projections 74 connected to both the left and right sides, The torso portion 72 is located below the aforementioned top portion 71, The bottom portion 73 provided below the body portion 72, The upper overlapping plate 34 and the upper sealing portion 53 provided laterally on the upper edge 21 or near the upper edge 21 of the top side plate 41, The upper overlapping plate 34 and the upper edge portion 21 of the top side plate 41, and / or the side edge portion 11 of the top side plate 41, and the anti-slip recess 77 provided on these, The device includes an opening indicator line 51 that starts at or near the anti-slip recess 77 and ends at the upper edge 21 or the side edge 11, other than the upper edge 21 or the side edge 11 on which the anti-slip recess 77 is provided.

[0011] Furthermore, in the paper container 95 of this disclosure, The surface of the paper substrate layer 782 of the laminated sheet 78 at the location where the opening indicator line 51 is provided may be flat.

[0012] Furthermore, in the paper container 95 of this disclosure, The aforementioned anti-slip recess 77 is a side edge anti-slip recess 771 provided on one of the side edges 11, The opening indicator line 51 may start at the side edge anti-slip recess 771 and end at the upper edge portion 21.

[0013] Furthermore, in the paper container 95 of this disclosure, The opening indicator line 51 includes a first opening indicator line 511 that starts at the side edge anti-slip recess 771 and ends in the area of ​​the upper overlapping plate 34, The system may also include a second opening indicator line 512 that starts at the end of the first opening indicator line 511 and ends at the upper edge portion 21.

[0014] Furthermore, in the paper container 95 of this disclosure, A second opening indicator line 512 may be provided, which starts in the middle of the first opening indicator line 511 and ends at the upper edge portion 21.

[0015] Furthermore, in the paper container 95 of this disclosure, The aforementioned anti-slip recess 77 is a side edge anti-slip recess 771 provided on one of the side edges 11, The opening indicator line 51 may start at the side edge anti-slip recess 771 and end at the other side edge 11.

[0016] Furthermore, in the paper container 95 of this disclosure, The anti-slip recess 77 is a side-edge anti-slip recess 771 provided on one of the side edges 11, The unsealing indication line 51 may include a first unsealing indication line 511 starting from the side-edge anti-slip recess 771 and ending at the other side edge 11, and a second unsealing indication line 512 starting from a midpoint of the first unsealing indication line 511 and ending at the upper edge 21.

[0017] Also, in the paper container 95 of the present disclosure, the anti-slip recess 77 is an upper-edge anti-slip recess 772 provided on the upper edge 21, and the unsealing indication line 51 may start from the upper-edge anti-slip recess 772 and end at one of the side edges 11.

[0018] Also, in the paper container 95 of the present disclosure, the unsealing indication line 51 may include a second unsealing indication line 512 starting from the upper-edge anti-slip recess 772 and ending in the area of the upper overlapping plate 34, and a first unsealing indication line 511 starting from the end of the second unsealing indication line 512 and ending at the side edge 11.

[0019] Also, in the paper container 95 of the present disclosure, the unsealing indication line 51 may include at least two unsealing indication lines 51, one starting from the upper-edge anti-slip recess 712 and ending at one of the side edges 11 and the other ending at the other side edge 11.

[0020] Also, in the paper container 95 of the present disclosure, the first unsealing indication line 511 is a straight line, and the second unsealing indication line 512 has a curved portion in contact with the first unsealing indication line 511, and the radius of curvature of the curved portion may be 2 mm or more.

[0021] Also, in the paper container 95 of the present disclosure, the paper container 95 may include two or more upper-edge anti-slip recesses 772.

[0022] Furthermore, in the paper container 95 of this disclosure, At least one of the opening indicator lines 51 may have anti-slip recesses 77 at both its starting and ending ends.

[0023] Furthermore, in the paper container 95 of this disclosure, The anti-slip recess 77 may include a curve that is convex toward the inside of the blank plate 10.

[0024] Furthermore, in the paper container 95 of this disclosure, The radius of curvature of the curve of the anti-slip recess 77 may be 1 mm or more.

[0025] Furthermore, in the paper container 95 of this disclosure, The anti-slip recess 77 is rectangular in shape, and the two inner corners of the blank plate 10 may be curved.

[0026] Furthermore, in the paper container 95 of this disclosure, The radius of curvature of the curve of the anti-slip recess 77 may be 0.5 mm or more.

[0027] Furthermore, in the resealable paper container 90 of this disclosure, A chuck tape 61 extending laterally may be provided below the upper sealing portion 53, on the upper overlapping plate 34 and the top side plate 41.

[0028] Furthermore, in the resealable paper container 90 of this disclosure, An opening indicator line 51 may be provided on the upper side of the zipper tape 61.

[0029] Furthermore, in the resealable paper container 90 of this disclosure, Below the aforementioned chuck tape 61, A third opening indicator line 513 may be provided, starting from the side edge 11 of one side plate 41 of the top section and ending at the side edge 11 of the other side plate 41 of the top section. [Effects of the Invention]

[0030] The embodiments of this disclosure described above provide the following paper containers. In other words, the aim is to provide paper containers that reduce processing steps and thus lower costs, paper containers that are less likely to experience a decrease in barrier properties, and paper containers that reduce failures during manufacturing and minimize the loss of blank sheets. [Brief explanation of the drawing]

[0031] [Figure 1A] This is an unfolded view of the back blank plate 10a used in the manufacture of the zippered paper container 90 of the first embodiment. [Figure 1B] This is an unfolded view of the front blank plate 10b used in the manufacture of the zippered paper container 90 of the first embodiment. [Figure 2] This is a front view showing the shape of the paper container (flat state) 91 in the intermediate stage when manufacturing a paper container 90 with a zipper using the blank plate 10 shown in Figures 1A and 1B. [Figure 3] Figures 1A and 1B show a perspective view of the shape of the paper container (assembled) 92 at an intermediate stage when manufacturing a resealable paper container 90 using the blank plate 10. [Figure 4] This is a perspective view of a resealable paper container 90 made using the blank plate 10 shown in Figures 1A and 1B. [Figure 5] Figure 4 is a side view of the resealable paper container 90. [Figure 6] Figure 4 is a plan view of the resealable paper container 90. [Figure 7] Figure 4 is a front view of the resealable paper container 90. [Figure 8] This is a perspective view of a resealable paper container 93 with the upper seal portion 53 removed. [Figure 9] This is a perspective view of a resealable paper container 94 with an open top 71. [Figure 10A] This is a cross-sectional view of a laminated sheet 78 in one aspect of the blank plate 10. [Figure 10B] This is a cross-sectional view of a laminated sheet 78 in another embodiment of the blank plate 10. [Figure 10C] This is a cross-sectional view of a laminated sheet 78 in yet another embodiment of the blank plate 10. [Figure 10D] This is a cross-sectional view of a laminated sheet 78 in yet another embodiment of the blank plate 10. [Figure 11A] An enlarged cross-sectional view of one aspect of the joint between the blank plate 10 and the chuck tape 61 is shown. (See Figure 2, cross-sectional position AA). [Figure 11B] This is an enlarged cross-sectional view of another aspect of the joint between the blank plate 10 and the chuck tape 61. (See Figure 2, section AA). [Figure 12A] This is an unfolded view of the back blank plate 10a used in the manufacture of the zippered paper container 90 of the second embodiment. [Figure 12B] This is an unfolded view of the front blank plate 10b used in the manufacture of the zippered paper container 90 of the second embodiment. [Figure 13A] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the third embodiment. [Figure 13B] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the fourth embodiment. [Figure 13C] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the fifth embodiment. [Figure 13D] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the sixth embodiment. [Figure 13E] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the seventh embodiment. [Figure 13F] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the eighth embodiment. [Figure 13G] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the ninth embodiment. [Figure 13H] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the resealable paper container 90 of the tenth embodiment. [Figure 13I]This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the resealable paper container 90 of the eleventh embodiment. [Figure 13J] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the twelfth embodiment. [Figure 13K] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the thirteenth embodiment. [Figure 13L] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the fourteenth embodiment of the resealable paper container 90. [Figure 13M] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the resealable paper container 90 of the fifteenth embodiment. [Figure 13N] This is a partially enlarged view of the intermediate stage paper container (flat state) 91 of the zippered paper container 90 of the sixteenth embodiment. [Figure 14] This is a perspective view of the zippered paper container 94 of the fourth embodiment, in which a portion of the upper seal portion 53 has been removed. [Figure 15] This is a perspective view of the resealable paper container 96 of the thirteenth embodiment, cut along the third opening indicator line 513. [Figure 16] This is a perspective view of the paper container 95 of the seventeenth embodiment, which does not have a zipper tape. [Figure 17A] This is an explanatory diagram of one embodiment of the anti-slip recess 71. [Figure 17B] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 17C] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 17D] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 17E] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 17F] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 17G] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 17H] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 17I] This is an explanatory diagram of another embodiment of the anti-slip recess 71. [Figure 18] This is an unfolded view of a blank plate 81 used in the manufacture of a conventional paper container 80 with a zipper. [Figure 19] This is a perspective view of a conventional resealable paper container 80. [Figure 20] Figure 19 is a perspective view of the resealable paper container 80 with its top 871 open. [Modes for carrying out the invention]

[0032] The present disclosure will be described below with reference to the drawings. However, this disclosure is not limited to these specifically shown forms or the various specifically described structures. Please note that in each diagram, the size and proportions of the components may be altered or exaggerated for clarity. Also, unnecessary or repetitive symbols may be omitted for readability.

[0033] Furthermore, the numerical values ​​such as dimensions and material names of each component described herein are merely examples of embodiments and are not limiting; they can be selected and used as appropriate. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and perpendicular, are used not only in their strict sense but also to include substantially the same conditions.

[0034] In describing the embodiments of this disclosure, we will use a resealable paper container 90 equipped with a zipper tape 61 as an example. However, the same applies to a paper container 95 without a zipper tape, provided that the zipper tape 61 and the process of joining the zipper tape 61 are omitted.

[0035] The blank plate 10 of the resealable paper container 90 of this disclosure is formed in a rectangular shape using a laminated sheet 78 in which a paper base material layer 782 is laminated and at least the innermost layer is a thermoplastic resin such as polyethylene, and various folding lines provided within the blank plate 10 divide the forming plates for each part necessary for forming the resealable paper container 90.

[0036] <First Embodiment of this Disclosure> <Blank plate> The blank plates 10 of the zippered paper container 90 of this embodiment are shown in Figures 1A and 1B. Figure 1A shows the back blank plate 10a, and Figure 1B shows the front blank plate 10b. The two blank plates, the back blank plate 10a and the front blank plate 10b, are collectively referred to as the blank plate 10.

[0037] Furthermore, unless otherwise specified, in each component of the blank plate 10 described later, the subscript 'a' of each symbol indicates an element of the back blank plate 10a, and the subscript 'b' indicates an element of the front blank plate 10b. In elements that have both subscripts 'a' and 'b', symbols without subscripts may include both 'a' and 'b'.

[0038] Here, the upper back edge 21a, which is the bottom of the drawing of the back blank plate 10a in Figure 1A, becomes the top of the resealable paper container 90. Similarly, the upper front edge 21b, which is the top of the drawing of the front blank plate 10b in Figure 1B, becomes the top of the resealable paper container 90.

[0039] In both Figure 1A and Figure 1B, the front side of the drawing represents the outer surface of the assembled zippered paper container 90, and the back side represents the inner surface. Figures 1A and 1B are symmetrical with respect to their respective upper edges 21a and 21b. When the inner surfaces of the back blank plate 10a and the front blank plate 10b are aligned and superimposed, each component (such as the molded plates, lines, sealing parts, and chuck tape joints described later) overlaps.

[0040] The aforementioned back blank plate 10a and front blank plate 10b, which are aligned and stacked, are joined together to create an intermediate zippered paper container (flat state) 91 as shown in Figure 2. Further, an intermediate zippered paper container (folded state) 92 as shown in Figure 3 is created, and the process proceeds toward the completion of the zippered paper container 90. This manufacturing method will be described later.

[0041] Unless otherwise specified, Figure 1B will be used to indicate the top, bottom, left, and right of the front blank plate 10b. The back blank plate 10a will also be described with its upper edge 21a as the top. Therefore, in Figure 1A, the top and bottom will be reversed. In the zippered paper container 90, the upper edge 21 will be considered the top and the lower edge 26 will be considered the bottom.

[0042] Figure 4 shows the formed resealable paper container 90, which is composed of a top section 71, a body section 72, and a bottom section 73, in that order from the top. The top section is sometimes referred to as the top section, and the bottom section as the bottom section. When describing the vertical direction of each component provided on the top section 71, the term "top section" may refer to the upper edge section 21, and when describing the vertical direction of each component provided on the bottom section 73, the term "bottom section" may refer to the lower edge section 26. Unless otherwise specified, the front, back, left, right, top, and bottom of the resealable paper container 90 will be shown with reference to Figure 4, with the front wall panel 31b as the front. The same applies to other examples, such as the resealable paper container 80 of the comparative example, which will be described in detail later.

[0043] As described above, the back blank plate 10a and the front blank plate 10b are almost symmetrical in shape vertically, so the explanation of the blank plate 10 will be given using the front blank plate 10b. In addition, the back blank plate 10a and the front blank plate 10b are the same in terms of material (layer structure) and manufacturing method.

[0044] The front blank plate 10b of the zippered paper container 90 in this embodiment is formed in a substantially rectangular shape using a laminated sheet 78 which is made by laminating at least a base paper and laminating at least a thermoplastic resin such as polyethylene as the innermost layer. Referring to Figure 1B, the top is the front upper edge portion 21b, the left and right sides are the front side edges 11b, and the bottom is the front lower edge portion 26b. Furthermore, the front blank plate 10b has a symmetrical shape with a vertical line passing through its center in the width direction as the line of symmetry. The laminated sheet 78 will be described later.

[0045] The front blank plate 10b is provided with a first transverse fold line 22b, a second transverse fold line 23b, a third transverse fold line 24b, and a fourth transverse fold line 25b, which are located in the transverse direction, starting from the upper edge 21b of the front surface. It is desirable that these transverse fold lines 22b, 23b, 24b, and 25b are parallel to the upper edge 21b and the lower edge 26b of the front surface, respectively.

[0046] The front blank plate 10b is provided with, in order from left to right, a first front vertical fold line 12b, a second front vertical fold line 13b, a second front vertical fold line 13b, and a first front vertical fold line 12b. That is, the vertical fold line closer to the side edge 11b of each front blank plate 10b is the first front vertical fold line 12b, and the vertical fold line further from the side edge 11b of the front blank plate 10b is the second front vertical fold line 13b. It is desirable that these front vertical fold lines 12b and 13b are approximately parallel to the side edge 11b of the front blank plate 10b.

[0047] Furthermore, a pair of diagonal fold lines 17b on the top of the front surface and a pair of diagonal fold lines 18b on the bottom of the front surface are provided on the left and right sides, respectively, and the forming plates for each part necessary for forming the zippered paper container 90 are partitioned and configured.

[0048] The diagonal fold line 17b on the top of the front surface starts at the second top intersection point Fb, which is the intersection of the second vertical fold line 13b and the second horizontal fold line 23b on the front surface. Furthermore, the diagonal fold line 17b on the top of the front surface connects the second top intersection point Fb to the first top intersection point Eb, which is the intersection of the first vertical fold line 12b and the first horizontal fold line 22b on the front surface, and extends further to the side edge 11b on the front surface. The intersection of the side edge 11b and the diagonal fold line 17b on the top of the front surface is the endpoint of the diagonal fold line 17b on the top of the front surface.

[0049] The diagonal fold line 18b on the front bottom originates from the second bottom intersection point Hb on the front, which is the intersection of the second vertical fold line 13b on the front and the third horizontal fold line 24b on the front. Furthermore, the diagonal fold line 18b on the front bottom connects the aforementioned second bottom intersection point Hb to the first bottom intersection point Gb on the front, which is the intersection of the first vertical fold line 12b on the front and the fourth horizontal fold line 25b on the front, and extends further to the front side edge 11b. The intersection of the front side edge 11b and the diagonal fold line 18b on the front bottom is the endpoint of the diagonal fold line 18b on the front bottom.

[0050] Furthermore, the diagonal fold line 17b on the top of the front surface may be located near the intersection Fb of the second top of the front surface, without touching it. In addition, the diagonal fold line 18b on the bottom of the front surface may be located near the intersection Hb of the second bottom of the front surface, without touching it.

[0051] Furthermore, the diagonal fold line 17b on the top of the front surface does not touch the first top intersection point Eb on the front surface, and its vicinity does not need to exist. Alternatively, the diagonal fold line 17b on the top of the front surface does not need to exist between the first top intersection point Eb on the front surface and the side edge 11b on the front surface. Moreover, the diagonal fold line 18b on the bottom of the front surface does not touch the first bottom intersection point Gb on the front surface, and its vicinity does not need to exist. Alternatively, the diagonal fold line 18b on the bottom of the front surface does not need to exist between the first bottom intersection point Gb on the front surface and the side edge 11b on the front surface.

[0052] By ensuring that each of the diagonal fold lines on the front side and their respective intersection points are located in close proximity without touching, sufficient bending performance is achieved while preventing excessive concentration of fold lines in specific locations, thereby preventing a decrease in the strength of the laminated sheet of the front blank plate 10b.

[0053] On both the left and right sides of the front blank plate 10b, a front side edge seal allowance 36b is formed via the front first vertical fold line 12b. Furthermore, a front bottom sealing allowance 37b is formed on the front lower edge portion 26b located below the front blank plate 10b, via the front fourth transverse fold line 25b. Furthermore, the front blank plate 10b is provided with forming plates for each part sequentially in a downward direction from the upper edge portion 21b located at its very top.

[0054] To describe the main parts, a front upper overlapping plate 34b is provided below the central region of the front upper edge portion 21b. Below the front upper overlapping plate 34b, a front top panel 33b is connected via a front first horizontal fold line 22b. Below the front top panel 33b, a front wall panel 31b is connected via a front second horizontal fold line 23b. Below the front wall panel 31b, a front bottom panel 35b is connected via a front third horizontal fold line 24b.

[0055] Furthermore, the side panels 41b of the top of the front surface are connected to the outer sides of both the left and right sides of the upper overlapping front surface panel 34b via the second vertical folding line 13b of the front surface. Furthermore, the front top projection 38b is connected to the outer sides of both the left and right sides of the front top panel 33b via the front second vertical folding line 13b. Furthermore, the front side panels 32b are connected to the left and right outer sides of the front wall panel 31b via the front second vertical folding line 13b. Furthermore, the front bottom protrusions 43b are connected to the outer sides of both the left and right sides of the front bottom plate 35b via the front second vertical folding line 13b.

[0056] Furthermore, a front top projection 38b is attached to the underside of each front top side plate 41b via a front first horizontal fold line 22b. A front side plate 32b is attached to the underside of the front top projection 38b via a front second horizontal fold line 23b. A front bottom projection 43b is attached to the underside of the front side plate 32b via a front third horizontal fold line 24b.

[0057] The bottom sealing portion 37b is connected to the top bottom plate 35b and the bottom protruding portions 43b on both the left and right sides of the top bottom plate 35b.

[0058] On the left and right outer sides of the top side plate 41b, the top protruding portion 38b, the side plate 32b, and the bottom protruding portion 43b of the front surface, a front side edge sealing portion 36b is provided via the first vertical folding line 12b of the front surface.

[0059] In this embodiment, the process of creating fold lines on the blank plate 10 (creasing) is performed after the laminated sheet 78 is completed, and then the laminated sheet is supplied to the machine that manufactures the zippered paper container 90. Alternatively, the creasing may be performed on the machine that manufactures the zippered paper container 90.

[0060] As for the method of creasing, an appropriate method can be adopted from known methods such as the platen method or the rotary die method. Alternatively, the laminated sheet 78 may be cut into sheets before creasing. Alternatively, the laminated sheet 78 may be supplied to the creasing process in roll form.

[0061] Next, we will describe the punching process for manufacturing a blank plate 10 by punching out the laminated sheet 78. The punching process can be selected from known methods such as a platen method or a rotary die method. The blank plate 10 may be formed directly from the roll-shaped laminated sheet 78, or it may be cut into individual sheets first and then punched out. The order of the scoring process and the punching process is not specified. They may be processed simultaneously.

[0062] Alternatively, a roll of laminated sheet 78 slit to a predetermined roll width may be supplied to a machine that manufactures a paper container with a zipper 90, where it may be cut in the transverse direction to produce a blank plate 10.

[0063] Furthermore, the back blank plate 10a is identical in shape to the front blank plate 10b, being symmetrical. In other words, it is a blank plate with almost the same shape but with the layer configuration reversed.

[0064] Figure 2 is a front view showing the shape of a zippered paper container (flat state) 91 in an intermediate stage when manufacturing a zippered paper container 90 using the blank plate 10 shown in Figures 1A and 1B. The top is the upper edge 21b of the front blank plate 10b shown in Figure 1B, and a back blank plate 10a is provided on the back side. The back blank plate 10a is not visible to the naked eye, but when viewed through, it has almost the same shape as the front blank plate 10b.

[0065] In Figure 2, the back blank plate 10a and the front blank plate 10b overlap, and each component is in the same positional relationship when viewed through the drawing, within the range of manufacturing variations. Therefore, the markings and subscripts on the front side may be omitted in the explanation.

[0066] Side plates 41 are attached to both the left and right sides of the upper overlapping plate 34. These three forming plates together are referred to as the top flap 45. On the top flap 45, an upper sealing portion 53, an opening indicator line 51, and a chuck tape joint portion 52 are provided sequentially from the upper edge 21 at predetermined positions where the two blank plates 10 described above overlap each other, serving as a means of sealing in the transverse direction.

[0067] The upper sealing portion 53 is provided at a distance from or near the upper edge 21 of the upper overlapping plate 34 and the upper side plate 41 of each top portion. If the upper sealing portion 53 is approximately parallel to the upper edge 21, the length of the upper sealing portion 53 can be shortened and no waste occurs in the blank plate 10.

[0068] The upper seal portion 53, which serves as a transverse sealing means, is formed by joining the opposing front upper seal portion 53b and the back upper seal portion 53a. This joining is performed so as to traverse the entire width of the upper edge 21 of the resealable paper container 90, or the vicinity of the upper edge 21, thereby maintaining the airtight seal of the resealable paper container 90.

[0069] Furthermore, it is desirable that the zipper tape joint 52 be substantially parallel to the upper edge 21. In such a configuration, opening and closing the zipper tape 61 and removing the contents becomes easier. In addition, the length of the zipper tape 61 can be shortened.

[0070] <Opening indicator line> Let me explain the opening indicator line 51. The top flap 45b on the front side may be provided with a front opening indicator line 51b as a means of indicating the initial opening position. By providing the front opening indicator line 51b, the desired cutting position for initial opening can be clearly indicated. The opening indicator line 51 includes the first opening indicator line 511, the second opening indicator line 512, and the third opening indicator line 513, which will be described later.

[0071] In this embodiment, the opening indicator line 51 is provided on both the front blank plate 10b and the back blank plate 10a, and, like other folding lines, is symmetrical with respect to the upper edge portion 21. Furthermore, the surface of the paper base material layer 782 of the laminated sheet 78 of the blank plate 10 at the location where the opening indicator line 51 is provided may be flat. A flat surface means that no processing such as cutting or perforating has been performed on the paper base material layer 782 that would cause a deterioration in strength. The paper base material layer 782 may have its own inherent fine irregularities or undulations on its surface. Examples of the opening indicator line 51 include various types of printing such as gravure printing, foil stamping, stamping, and transfer printing, which are visually visible. The surface on which the opening indicator line 51 is provided may be the outer surface of the paper substrate layer 782 or the outer surface of the laminated sheet 78.

[0072] As shown in Figure 2, the front opening indicator line 51b in this embodiment is the front first opening indicator line 511b that extends in the transverse direction of the top flap 45, and is connected from one (in this case, the right) front side edge 11b of the front blank plate 10b to the other (in this case, the left) front side edge 11b, and is located between the front upper seal portion 53b and the chuck tape 61.

[0073] Furthermore, an anti-slip recess 77 may be provided on either the left or right side of the end of the first opening indicator line 511b on the front side. The anti-slip recess 71 includes the side edge anti-slip recess 771 and the upper edge anti-slip recess 772, which will be described later. In this embodiment, the side edge anti-slip recess 771 is provided on the right side of the front edge portion 11b. Alternatively, the side edge anti-slip recess 771 may be provided on the left side of the front edge portion 11b. Furthermore, the opening indicator line 51 and the anti-slip recess 77 may be in contact, or they may be located in close proximity to each other even if they are not in contact.

[0074] The opening indicator line 51 has not been specially processed to make it easier to cut, and therefore it is difficult to cut it with just the user's fingers. For this reason, a cutting tool, such as scissors, a cutter, or a knife, should be used. Hereafter, a cutter will be used as an example of a cutting tool. When initially opening the top 71 of the resealable paper container 90, the user brings the cutter to the end of the front first opening indicator line 511b on the front side edge 11b. At this time, the cutter fits into the side edge anti-slip recess 771, allowing the user to start cutting the top flap 45 from the appropriate position. Then, according to the target front first opening indicator line 511b, the container can be opened properly.

[0075] If the side edge anti-slip recess 771 is not present, the cutter may move along the side edge 11 and may not be able to maintain the correct position. Also, if the first opening indicator line 511b on the front side is not present, there is a risk that the cut may not be able to be made at the correct position.

[0076] By cutting the first opening indicator line 511b on the front side from one (in this case, the right) front side edge 11b to the other (in this case, the left) front side edge 11b, the top flap 45 is cut transversely, and the upper seal portion 53 is also removed, exposing the zipper tape 61 over almost its entire surface.

[0077] The opening indicator line 51 may be printed at the same time as the image printing, and gravure printing, offset printing, inkjet printing, etc. may be used.

[0078] Furthermore, the opening indicator line 51 may be in the shape of a strip with a certain width. Also, multiple opening indicator lines 51 may be provided. This allows for indicating the permissible range of the cutting position for initial opening.

[0079] <Chuck Tape> The chuck tape 61 is formed by extrusion molding of a male chuck tape 61m and a female chuck tape 61f, with the male chuck tape fitting portion 63m and the female chuck tape fitting portion 63f being fitted together.

[0080] <Instructions for joining chuck tape> The assembly procedure for the resealable paper container 90 will be explained later, but here we will explain the procedure for joining the resealable tape 61.

[0081] In this case, the zipper tape joint 52 is the planned joint for the zipper tape 61 when assembling the zippered paper container 90.

[0082] The back blank plate 10a and the front blank plate 10b are placed on top of each other, and the side edge sealing portions 36 and the upper sealing portions 53 are heat-sealed together. At this time, the male chuck tape 61m and female chuck tape 61f are pre-fitted together at the male chuck tape fitting portion 63m and female chuck tape fitting portion 63f, and the chuck tape 61 is inserted into this portion. Simultaneously, the chuck tape joint portion 52 is heated and pressurized from the outer surface of the two blank plates 10. Then, the blank plates 10 and the chuck tape 61 are heat-sealed. (See Figures 11A and 11B).

[0083] Furthermore, the joining of the chuck tape 61 to the blank plate 10 is not limited to the heat sealing method described above; it may also be joined by other methods such as adhesive or adhesive tape.

[0084] By heat-sealing the chuck tape 61 in this manner, the misalignment of the heat seal is reduced compared to the method of heat-sealing the male chuck tape 61m and the female chuck tape 61f separately to the chuck tape joint 52, and the installation process is simplified, allowing the chuck tape 61 to be installed with production efficiency.

[0085] <Laminated blank sheet> As mentioned above, the laminated sheet 78 used for the blank plate 10 is a laminated sheet 78 in which at least a paper base material layer 782 is laminated and at least the innermost thermoplastic resin layer 783 is made of a thermoplastic resin such as polyethylene. In addition, a barrier layer 785 for water vapor, oxygen and other substances, or a strength-enhancing layer may be provided in the intermediate layer as needed.

[0086] Furthermore, when a printed layer such as a design is provided on the resealable paper container 90 of this embodiment, it is usually printed on the surface of the paper substrate layer 782. However, if the printability of the paper substrate layer 782 is poor, the printed layer such as a design can be provided on, for example, a biaxially oriented polyethylene terephthalate film, and that film can be laminated onto any of the outer layers of the paper substrate layer 782.

[0087] The paper base layer 782 will now be described. The paper base layer 782 is preferably made of paper that is rigid and resistant to cracking when folded along a fold line, but it is not particularly limited and can be appropriately selected and used depending on the contents to be filled into the resealable paper container 90, taking into consideration water resistance (size) and other factors. For example, high-quality paper, cup paper, and milk carton paper can be suitably used, with a basis weight of 80 g / m². 2 More than 320g / m 2 The following range is appropriate.

[0088] This section describes the thermoplastic resin layer (sealant layer) used in the innermost layer, and optionally in the outermost and intermediate layers. The resin used for the thermoplastic resin layer (sealant layer) can include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-α-olefin copolymer polymerized using a single-site catalyst, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), random copolymer of ethylene-methacrylic acid (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ionomers, polypropylene and its copolymers, and polyester resins. From these, the most suitable resin can be appropriately selected and used depending on the contents being filled and the storage and usage conditions.

[0089] Among the thermoplastic resins mentioned above, ethylene-methyl acrylate copolymer (EMA) and ethylene-methacrylic acid random copolymer (EMAA) are particularly excellent in terms of thermal stability during processing such as extrusion coating, adhesion to various substrates, and low-temperature heat sealability, as well as excellent thin-film formation properties. Therefore, it is easy to extrude and laminate the outermost thermoplastic resin layer, which does not require much thickness, to a relatively thin thickness, for example, 6 μm or more and 10 μm or less. This reduces the proportion of plastic material used and also provides cost advantages.

[0090] The innermost layer, and optionally the outermost and intermediate thermoplastic resin layers (sealant layers), can be laminated by extruding a resin coating onto their laminated surfaces after applying an easy-adhesion treatment such as an anchor coat, corona treatment, or flame treatment as needed. Alternatively, the thermoplastic resin can be pre-formed into a film, and then laminated by bonding the film using known methods such as dry lamination or extruded lamination (sandwich lamination).

[0091] When a barrier layer 785 is laminated as an intermediate layer of a laminated sheet 78, the barrier layer 785 can be a metal foil such as aluminum foil, or a vapor-deposited film in which metals or inorganic oxides such as aluminum, silica, or alumina are vapor-deposited onto a base film such as biaxially oriented polyethylene terephthalate film (hereinafter referred to as PET film), biaxially oriented nylon film (ONy film), or biaxially oriented polypropylene film (OPP film) to a thickness of 20 nm or more and 100 nm or less. Alternatively, ethylene vinyl acetate copolymer saponified film (hereinafter sometimes referred to as EVOH), biaxially oriented nylon MXD6 film, polyacrylonitrile film, and PET film, ONy film, or OPP film with a polyvinylidene chloride coating layer can be used.

[0092] Such a barrier layer 785 is usually preferably laminated on the inner surface of the paper substrate layer 782 in order to effectively utilize its barrier properties. However, if a metal foil such as aluminum or a metal vapor-deposited film is used for the barrier layer 785, it can also be laminated on the outer surface of the paper substrate layer 782 in order to utilize its metallic appearance in the design. The barrier layer 785 can be easily laminated by known methods such as dry lamination or extrusion lamination (sandwich lamination).

[0093] The layer structure of the laminated sheet 78 of the blank plate 10 of the zippered paper container 90 of this embodiment is illustrated. Cross-sectional views of the laminated sheet 78 are shown in Figures 10A, 10B, 10C, and 10D.

[0094] Figure 10A is a cross-sectional view of a laminated sheet 78 of a blank plate 10 consisting of three layers, the layer configuration being as follows, where " / " indicates the boundary between adjacent layers. (Outer surface) Outermost thermoplastic resin layer 781 / Paper substrate layer 782 / Innermost thermoplastic resin layer 783 (inner surface)

[0095] Figure 10B is a cross-sectional view of a laminated sheet 78 of a blank plate 10 consisting of two layers, and its layer configuration is as follows. (Outer side) Paper substrate layer 782 / Innermost thermoplastic resin layer 783 (Inner side) This is a layer configuration obtained by removing the outermost thermoplastic resin layer 781 from the three-layer blank plate 10 shown in Figure 10A.

[0096] Furthermore, if barrier properties (water vapor, oxygen, aroma retention, etc.) are required for the blank plate 10, a barrier layer 785 can be provided. Figure 10C is a cross-sectional view of a laminated sheet 78 of the blank plate 10, which consists of 5 layers, and its layer configuration is as follows. (Outer surface) Outermost thermoplastic resin layer 781 / Paper substrate layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (Inner surface)

[0097] Figure 10D is a cross-sectional view of a laminated sheet 78 of a blank plate 10 consisting of four layers, the layer configuration of which is as follows. (Outer surface) Paper substrate layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (inner surface) This is the layer configuration obtained by removing the outermost thermoplastic resin layer 781 from the five-layer blank plate 10 shown in Figure 10C.

[0098] The bonding between each layer of the above laminated sheets 78 is performed by known methods such as dry lamination, extrusion coating, or adhesive. Note that the layers used for bonding between layers may not be shown due to their thinness.

[0099] <Manufacturing of resealable paper containers> This document outlines the procedure from the blank sheet 10 of the resealable paper container 90 to the intermediate stage resealable paper container (flat state) 91, then to the intermediate stage resealable paper container (folded state) 92, and finally to the completion of the resealable paper container 90 package filled with contents.

[0100] <Preparation of a resealable paper container (flat state) in the intermediate stage> When the two blank plates 10 described above are stacked on top of each other, a chuck tape 61, which has a male chuck tape 61m and a female chuck tape 61f pre-fitted together, is inserted into the position where the chuck tape joint portions 52 overlap, and the chuck tape joint portions 52 are heated and pressurized from the outer surfaces of the two blank plates 10 to heat-seal them.

[0101] Next, the inner surfaces of the upper sealing portions 53 are heat-sealed together, and the inner surfaces of the side edge sealing portions 36 adjacent to the side edge portions 11 of the blank plate 10 are heat-sealed together. Then, the intermediate zippered paper container (flat state) 91 is formed into a bag shape with an opening at the lower edge portion 26.

[0102] Furthermore, a side edge anti-slip recess 771 is provided at one end of the first opening indicator line 511b on the front side. It is desirable that the anti-slip recess 77 be in the same position on both the front blank plate 10b and the back blank plate 10a, so it is desirable to process this in this step or subsequent steps.

[0103] The anti-slip recess 77 in this disclosure is for the purpose of preventing the cutter from slipping, and does not serve to concentrate stress on the user's fingers when cutting the top flap 45, so it does not need to be pointed toward the inside of the blank plate 10. It is preferable that it is not pointed in order to prevent cuts from occurring unintentionally.

[0104] Figures 17A to 17F illustrate examples of anti-slip recesses 77 used in this disclosure. However, the anti-slip recesses 71 used in this disclosure are not limited to these examples and may have other shapes as long as they serve the function of preventing the cutter from slipping. The sealing area shown here may be either the side edge sealing allowance 36 or the upper sealing portion 53, and the anti-slip recess 71 may be either the side edge anti-slip recess 771 or the upper edge anti-slip recess 772. In addition, the opening indicator line 51 may be any of the first opening indicator line 511, the second opening indicator line 512, or the third opening indicator line 513, and although their shapes are shown as straight lines, they may also be curved.

[0105] Regarding the positional relationship between the opening indicator line 51 and the anti-slip recess 71, Figures 17A to 17D show examples where they are in contact, while Figures 17E and 17F show examples where they are separated. When the opening indicator line 51 and the anti-slip recess 71 are separated, any misalignment of the anti-slip recess 71 during processing will not be noticeable, thus minimizing damage to the appearance. Furthermore, when the opening indicator line 51 is separated from the upper seal portion 53 or the side edge seal allowance 36, it is easy to apply foil stamping or the like to the surface of the blank plate 10 without creating a step in that area. If the opening indicator line 51 straddles the top flap 45 and the upper seal portion 53 or the side edge seal allowance 36, a step may be created, potentially making foil stamping or the like difficult to perform. Note that the combination of the opening indicator line 51 and the anti-slip recess 77 is not limited to the combinations exemplified in the figures.

[0106] The anti-slip recess 77 shown in Figure 17A is V-shaped and approaches the opening indicator line 51 as it moves inward from the blank plate 10, so that the cutting of the opening indicator line 51 is initiated more accurately. The anti-slip recess 77 shown in Figure 17B is U-shaped and has no sharp corners, making it less susceptible to accidental damage. The radius of curvature of the U-shape may be 1 mm or more, which prevents the top flap 45 from being cut in unintended situations. The anti-slip recess 77 shown in Figure 17C is V-shaped, and its inner corner of the blank plate 10 is curved. As a result, the opening is wide, making it easy to insert the cutter, and as you move inward towards the opening indicator line 51, you get closer to it, allowing for more accurate cutting of the opening indicator line 51. In addition, there are no sharp corners, making accidental damage less likely. The radius of curvature of the curve may be 1 mm or more, preventing unintended cutting of the top flap 45.

[0107] The anti-slip recess 77 shown in Figure 17D is semicircular. This makes it easy to create cutting tools for processing and also provides high durability. In addition to semicircles, shapes using a part of a circular arc are also acceptable, as exemplified in Figures 17E and 17F described later. The radius of curvature of the circular arc may be 1 mm or more. This prevents the top flap 45 from being cut unintentionally. The anti-slip recess 77 shown in Figure 17E is an arc. The central angle of this arc is shown as being less than 180°. The anti-slip recess 77 shown in Figure 17F is an arc. The central angle of this arc is shown as an example greater than 180°.

[0108] The anti-slip recess 77 shown in Figure 17G is a notch, and in this disclosure, the notch is also included in the anti-slip recess 77. An anti-slip effect can be obtained by inserting a cutter into this notch. Furthermore, by making the anti-slip recess 77 a cut, no chips are generated when forming the anti-slip recess, thus eliminating the need to dispose of chips. The anti-slip recess 77 shown in Figure 17H ​​is rectangular. The inner corners of the blank plate 10 are right angles and not acute angles, so accidental damage is less likely. The anti-slip recess 77 shown in Figure 17I is rectangular, and the two inner corners of the blank plate 10 are curved. There are no sharp corners, making accidental damage less likely. The radius of curvature of the curve may be 0.5 mm or more, which prevents the top flap 45 from being cut in unintended situations.

[0109] The resealable paper container 90 is not particularly limited in actual manufacturing, but to improve productivity, equipment may be used that performs the assembly of the paper container, the filling of the contents, and the sealing of each joint in-line.

[0110] In this apparatus, a long, rolled-up printed laminated sheet 78 may be unwound to perform processes such as folding lines, insertion and heat sealing of chuck tape 61, heat sealing of the side edge seal portion 36, heat sealing of the upper seal portion 53, and punching out of anti-slip recesses 77, in a form where paper containers are connected horizontally.

[0111] Furthermore, the order of the steps described above is not required if the desired resealable paper container 90 can be obtained.

[0112] Here, the shape of the top flap 45 of the zippered paper container 90 of this embodiment will be described with reference to Figure 2. The top flap 45 is provided with an upper seal portion 53, an opening indicator line 51, and a zipper tape 61 in order from the upper edge portion 21, and a first horizontal fold line 22 is located below the zipper tape 61.

[0113] Incidentally, in the intermediate stage of the zippered paper container (flat state) 91, Figures 11A and 11B show enlarged cross-sectional views of the joint of the zipper tape 61, which is the point where the zipper tape 61 and the blank plate 10 are joined. The cutting point is shown at cross-sectional position AA in Figure 2. Here, the blank plate 10 is exemplified by the four-layer laminated sheet 78 shown in Figure 10D.

[0114] In Figure 11A, a female chuck tape 61f is joined to the front blank plate 10b as the front chuck tape 61b. The female chuck tape 61f includes a female chuck tape body portion 62f that is joined to the blank plate 10 and a female chuck tape fitting portion 63f that has a recess for fitting with the male chuck tape 61m. Furthermore, a male chuck tape 61m is joined to the back blank plate 10a as a back chuck tape 61a. The male chuck tape 61m includes a male chuck tape body portion 62m that is joined to the blank plate 10 and a male chuck tape fitting portion 63m that has a protrusion that fits with the female chuck tape 61f.

[0115] In Figure 11B, a male chuck tape 61m is joined to the front blank plate 10b as the front chuck tape 61b. The male chuck tape 61m includes a male chuck tape body portion 62m that is joined to the blank plate 10 and a male chuck tape fitting portion 63m that has a protrusion that fits with the female chuck tape 61f. Furthermore, a female chuck tape 61f is joined to the back blank plate 10a as a back chuck tape 61a. The female chuck tape 61f includes a female chuck tape body portion 62f that is joined to the blank plate 10 and a female chuck tape fitting portion 63f that has a recess for fitting with a male chuck tape 61m.

[0116] Whether a male chuck tape 61m or a female chuck tape 61f is joined to the front blank plate 10b is selected as appropriate based on the required performance of the resealable paper container 90 and the specifications of the manufacturing equipment for the resealable paper container 90.

[0117] <Intermediate stage: Fabrication of a resealable paper container (folded state)> In this intermediate stage, a mandrel is inserted through the opening 73 at the bottom of the zippered paper container (flat state) 91, leaving the upper overlapping plate 34 in place. The top plate 33 below it is then spread forward and backward along the first horizontal fold line 22, causing the top flap 45, which consists of the upper overlapping plate 34 and the top side plate 41, to stand upright.

[0118] In order to ensure that the ridge portion 72d of the body portion 72 is bent properly, an auxiliary member may be brought into contact with the vicinity (including contact) of the ridge portion 72d from the inside and / or outside of the body portion 72.

[0119] An intermediate stage of a zippered paper container (folded box) 92 is formed, with a top section 71 including a top panel 33 and a body section 72 following below the upper overlapping plate 34, and a bottom section 73 opening in a roughly rectangular shape. At this stage, as shown in Figure 3, the upper overlapping plate 34 is standing upright in the upward direction.

[0120] Although the design assumes a rectangular shape for the horizontal cross-section of the body 72 and the opening of the bottom 73, the resealable paper container 90 is made of a flexible laminated sheet 78 mainly composed of paper, so it is designed to be approximately rectangular, including cases where it is not perfectly rectangular.

[0121] <Forming and filling of resealable paper containers> Next, the upper overlapping plate 34, which stands upright, is folded and laid down on the back side (back top plate 33a side), and the top protrusions 74 that protrude on both the left and right sides are folded in the direction of the side plates 32 and joined to the body 72. At this time, the bent portion 76 of the top protruding portion 74 is bent, and in order to ensure that the bending of the bent portion 76 is carried out properly, an auxiliary member may be brought into contact with the vicinity (including contact) of the bent portion 76 from the inside and / or outside of the top portion 71.

[0122] The method by which the top projection 74 is joined to the body 72 may include using an adhesive (such as hot melt), using adhesive tape, or using a mechanical joining method (such as an engaging method or using a fastener). Furthermore, if the outermost layer of the blank plate 10 is provided with a thermoplastic resin layer (sealant layer), the thermoplastic resin layer (sealant layer) may be heat-sealed. Similar methods are used for joining the bottom projection, which will be described later.

[0123] <Formation of the bottom of a resealable paper container> The bottom 73 of the intermediate-stage zippered paper container (folded box) 92 formed as described above is turned upward, and the contents are filled in through the opening at the bottom 73. Next, the third horizontal fold line 24 on the lower part of the wall panels 31 on both the front and back sides is folded in a mountain fold when viewed from the outside. Note that in the following explanation of how to fold the fold lines, the phrase "when viewed from the outside" may be omitted.

[0124] At the same time, the third transverse fold line 24 on the lower part of the side panels 32 on both the front and back sides and the left and right sides is folded inwards. Since the inner surfaces of the side edge seals 36 on both the front and back sides have already been joined together and are folded to the back side (back side panel 32a side), the third transverse fold line 24 on the lower part of the side panels 32 on both the front and back sides and the left and right sides can be easily folded. In this way, the bottom panels 35 on both the front and back sides are folded almost perpendicular to the wall panels 31, becoming almost a single flat surface, thus forming a stable bottom 73.

[0125] Then, the bottom protrusions 43 on both the left and right sides of the bottom plate 35 are folded in the direction of a mountain fold along the bottom diagonal fold line 18 in that area, so that the inner surfaces face each other but are not joined, and protrude downwards at the bottom of the body 72. When the fourth transverse fold lines 25 on both the front and back are folded in the valley fold, the bottom sealing area 37 stands upright and takes on a planar shape extending in the left and right directions. The inner surface of the front bottom sealing area 37b and the inner surface of the back bottom sealing area 37a are then superimposed and heated and pressurized from the outside of the bottom sealing areas 37 on both the front and back by a heated heater bar, so that the two are joined together and the resealable paper container 90 filled with contents is sealed. Although heat sealing with a heater bar is exemplified here, other known sealing methods such as ultrasonic sealing and high-frequency sealing may also be used.

[0126] The joined bottom seal portion 37 is folded to the back so as to approach the back top panel 33a. Here, the area of ​​the bottom seal portion 37 adjacent to the bottom protruding portion 43, the bottom diagonal bottom protruding portion 43 folded along the bottom diagonal bending line 18, and the area of ​​the side edge seal portion 36 adjacent to the bottom protruding portion 43 are superimposed, and these together form the bottom protrusion 75.

[0127] The third horizontal fold line 24 adjacent to the bottom protrusion 75 is folded in a mountain fold, and the second vertical fold line 13 adjacent to the bottom protrusion 75 is also folded in a mountain fold, so that the bottom protrusion 75 is folded inward so that it is close to the bottom plate 35. Furthermore, the bottom protrusion 75 and the bottom plate 35 and / or the front bottom seal allowance 37b are joined together to form the bottom 73. The packaging of the resealable paper container 90 filled with contents is then completed. As an example of a method for joining the bottom protrusion 75 to the bottom plate 35 and / or the top bottom sealing allowance 37b, various adhesives such as hot melt, emulsion adhesive, and rubber adhesive may be used. Alternatively, the thermoplastic resin layers provided on the outermost layer of the laminated sheet 78 of the blank plate 10 may be heat-sealed together.

[0128] Figure 4 is a perspective view showing the resealable paper container 90 of this embodiment. Figure 5 is a side view of the resealable paper container 90 shown in Figure 4. Figure 6 is a top view of the resealable paper container 90 shown in Figure 4. Figure 7 is a front view of the resealable paper container 90 shown in Figure 4.

[0129] The resealable paper container 90 shown in Figure 4 has an external shape that is roughly rectangular, and it has edges 72d on its body 72. Since the resealable paper container 90 is made of a flexible laminated sheet 78 mainly composed of paper, it is roughly rectangular, even if it is not a perfect rectangular shape.

[0130] <Opening action for removing the contents of a resealable paper container> This section describes the procedure for opening the top 71 of the completed resealable paper container 90 containing the contents in order to remove the contents. First, the top projection 74, which is attached to the body 72, is detached. Then, as the top projection 74 is lifted upward, the top side plate 41 rises up, and the upper overlapping plate 34 rises up accordingly. The top side plate 41 and the upper overlapping plate 34 then become almost flush.

[0131] Then, the user presses a cutter against the side edge anti-slip recess 771 provided on one side edge 11 (in this case, the right side). The user then moves the cutter along the opening indicator line 51 and further to the other side edge 11 (in this case, the left side), which crosses the top flap 45 and cuts off the upper seal portion 53. At this stage, the zipper tape 61 has not yet been separated and is in the shape shown in Figure 9, and this shape is called a zippered paper container 93 with the upper seal portion cut off. Furthermore, the portion of the apical flap 45 that remains above the first transverse fold line 22 after being cut along the opening instruction line 51 is called the post-excision apical flap 46.

[0132] Next, the user grasps the front opening gripping area 57b between the front opening indicator line 51b and the front zipper tape 61b, and the back opening gripping area 57a between the back opening indicator line 51a and the back zipper tape 61a, respectively, with their fingers and spreads the zippered paper container 90 outwards, thereby opening the zipper tape 61 that has been cut at the opening indicator line 51 and exposed. Figure 9 shows the zippered paper container 94 with its top 71 open.

[0133] During the opening operation of the chuck tape 61, the ends of the chuck tape 61 near the side edges 11 of each blank plate 10 open up to approximately the entire width up to the side edge sealing allowance 36. However, the side edge sealing allowance 36 is not peeled off. In this way, the male chuck tape 61m and the female chuck tape 61f of the chuck tape 61 separate, forming the removal opening 56.

[0134] <Second Embodiment> In this embodiment, the blank plates 10 of the resealable paper container 90 are shown in Figures 12A and 12B. The front blank plate 10b is shown in Figure 12B and is the same as in the first embodiment. The back blank plate 10a is shown in Figure 12A and is the same as the back blank plate 10a of the first embodiment except that the back opening indicator line 51a is removed. Furthermore, the intermediate resealable paper container 91, in which two blank plates 10 are superimposed and joined, is shown in Figure 2 and is the same as in the first embodiment, with a side edge anti-slip recess 771 provided on one side edge 11 (in this case, the right side). The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the resealable paper container 90, and the method of filling the resealable paper container 90 are the same as in the first embodiment.

[0135] In this embodiment, when assembling the resealable paper container, the front opening indicator line 51b is provided only on the front blank plate 10b, which is easily visible, and the back opening indicator line 51a may be omitted, which can reduce the effort required for processing. In the embodiments described below, the opening indicator line 51 is provided on both the front blank plate 10b and the back blank plate 10a, but it is preferable that it be provided on at least the front blank plate 10b. The explanation will be given using the front blank plate 10b.

[0136] <Third Embodiment> Figure 13A shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the resealable paper container (flat state) 91 has side edge anti-slip recesses 771 at both the left and right ends of the first opening indicator line 511b on the front. Therefore, the first opening indicator line 511b on the front can be cut from either the left or the right side, reducing the effort required for the user to change the orientation when gripping the resealable paper container 90.

[0137] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheets 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0138] <Fourth Embodiment> Figure 13B shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91, a side edge anti-slip recess 771 is provided on the front side edge 11b of one side (here, the right side) of the top flap 45. The starting point of the front first opening indicator line 511b is adjacent to the front blank plate 10b in the inward direction at the side edge anti-slip recess 771, and the front first opening indicator line 511b extends laterally, with its end located inside the top flap 45 and inside the front upper overlapping plate 34b. The side edge anti-slip recess 771 and the front first opening indicator line 511b are located in the region sandwiched between the upper seal portion 53 and the zipper tape 61. The front second opening indicator line 512b starts from the end of the front first opening indicator line 511b, begins with a smooth curve, and reaches the upper edge portion 21. At that time, it crosses the upper seal portion 53.

[0139] After the user aligns the cutter with the side edge anti-slip recess 771 and cuts the top flap 45 along the front first opening indicator line 511b and the front second opening indicator line 512b, a portion of the upper seal portion 53 remains. This remaining portion is designated as the opening restriction portion 58. Then, only the portion of the upper seal portion 53 that has been cut off is exposed to the zipper tape 61. When the zipper tape 61 is detached and the contents are removed, a limited-sized removal opening 56 is formed. Figure 14 shows a zippered paper container 94 with the removal opening 56 opened. Because the removal opening 56 is of an appropriate size, when the zippered paper container 90 is tilted and the contents are shaken out, an appropriate amount can be removed. The size of the opening restriction portion 58, that is, the position where the front second opening indicator line 512b crosses the upper seal portion 53, is set at a desired position considering the properties of the contents, the amount to be removed, etc.

[0140] When a user initially opens the resealable paper container 90, they should start cutting from the anti-slip recess 771 on the side edge using a cutter, and in order to smoothly proceed with cutting along the front opening indicator line 51b of the top flap 45, it is desirable that the transition from the front first opening indicator line 511b to the front second opening indicator line 512b be smooth. The front first opening indicator line 511b is a straight line or a line that is nearly straight, and the front second opening indicator line 512b preferably begins as a curve tangent to the front first opening indicator line 511b, and its radius of curvature may be 2 mm or more. With a radius of curvature of that size, it is easy to change the direction of the cutter, and the top flap 45 is cut in accordance with the indication of the front second opening indicator line 512b.

[0141] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0142] <Fifth Embodiment> Figure 13C shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91, a side edge anti-slip recess 771 is provided on one (here, the right side) front side edge 11b of the top flap 45. The starting point of the front first opening indicator line 511b is adjacent to the front blank plate 10b in the inward direction at the side edge anti-slip recess 771, and the front first opening indicator line 511b extends laterally, with its end reaching the other (here, the left side) front side edge 11b. The side edge anti-slip recess 771 is provided at its end. Furthermore, the second front-side opening indicator line 512b smoothly branches off in a curve from the middle of the first front-side opening indicator line 511b. The second front-side opening indicator line 512b crosses the upper seal portion 53 and reaches the upper edge portion 21.

[0143] After the user aligns the cutter with the anti-slip recess 771 on one side edge (in this case, the right side), and cuts the top flap 45 along the first front opening indicator line 511b and the second front opening indicator line 512b which branches off from the first front opening indicator line 511b, a portion of the upper seal portion 53 is left. This remaining portion becomes the opening limiting portion 58. Then, only the portion of the upper seal portion 53 that has been cut off is exposed to the chuck tape 61. The effect in this case is the same as in the fourth embodiment.

[0144] When the contents have decreased and only remain near the bottom of the resealable paper container 90, the user cuts the remaining first opening indicator line 511b on the front with a cutter, from the anti-slip recess 771 on the other (in this case, the left) front edge 11b to the second opening indicator line 512b on the front. Then, the top seal portion 53 is cut off, and the top portion 71 of the resealable paper container 90 opens almost entirely, making it easy to take out the remaining contents.

[0145] Furthermore, if a large amount of contents are to be removed from the initial opening, the contents may be cut from one (in this case, the right) side edge 11b to the other (in this case, the left) side edge 11b, without going through the second opening indicator line 512b on the front. The cutting direction may also be the opposite of the above.

[0146] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0147] <Sixth Embodiment> Figure 13D shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the resealable paper container (flat state) 91 has two additional second front opening indicator lines 512b that branch off from the first front opening indicator line 511b, in addition to the front opening indicator line 51b of the fourth embodiment. Therefore, in this embodiment, three second front opening indicator lines 512b are provided, and an appropriate second front opening indicator line 512b is selected to obtain a dispensing opening 56 that matches the amount of contents to be dispensed. The user can then cut the top flap 45 with a cutter to obtain a dispensing opening 56 of the appropriate size. Note that there may be two or more second front opening indicator lines 512b.

[0148] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0149] <Seventh Embodiment> Figure 13E shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91 extends the front first opening indicator line 511b of the sixth embodiment to the other side edge 11 (in this case, the left side). In this embodiment, similar to the sixth embodiment, two or more front-side second opening indicator lines 512b are provided, and an appropriate front-side second opening indicator line 512b is selected to obtain a dispensing opening 56 that matches the amount of contents to be dispensed. The user then cuts the top flap 45 with a cutter. This allows a dispensing opening 56 of the appropriate size to be obtained.

[0150] Furthermore, if the contents are running low and only remain near the bottom of the resealable paper container 90, the user cuts the remaining first opening indicator line 511b on the front with a cutter, from the anti-slip recess 771 on the other (in this case, the left) front side edge 11b to the second opening indicator line 512b on the front. Then, the top seal portion 53 is cut off, and the top portion 71 of the resealable paper container opens over almost its entire surface, making it easy to remove the remaining contents.

[0151] If a large amount of contents are to be removed from the initial opening, the contents may be cut from one side edge 11 (the right side in this case) to the other side edge 11 (the left side in this case) without going through the second opening indicator line 512b on the front. The cutting direction may also be the opposite of the above.

[0152] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0153] <Eighth Embodiment> Figure 13F shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91 is provided with a second opening indicator line 512b on the front side, as in the seventh embodiment. In addition, a second opening indicator line 512b on the front side is also provided, which smoothly branches off when cutting is started from the other (in this case, the left) side edge 11b of the front side. Therefore, it is possible to choose whether to provide the dispensing opening 56 on the left or right side of the resealable paper container 90.

[0154] Furthermore, if the contents are running low and only remain near the bottom of the resealable paper container 90, the user cuts the remaining first opening indicator line 511b on the front with a cutter, from the anti-slip recess 771 on the other (in this case, the left) front edge 11b to the second opening indicator line 512b on the front. Then, the top seal portion 53 is cut off, and the top portion 71 of the resealable paper container 90 opens almost entirely, making it easy to remove the remaining contents.

[0155] If a large amount of contents are to be removed from the initial opening, the contents may be cut from one side edge 11 (the right side in this case) to the other side edge 11 (the left side in this case) without going through the second opening indicator line 512b on the front. The cutting direction may also be the opposite of the above.

[0156] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0157] <Ninth Embodiment> Figure 13G shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91, the side edge anti-slip recess 771 provided on the front side edge portion 11b in the fourth embodiment is removed, and a new front upper edge anti-slip recess 772 is provided at the position where the upper edge portion 21 and the front second opening indicator line 512b intersect.

[0158] When the user cuts the front opening indicator line 51b with a cutter, they first align the cutter with the upper edge anti-slip recess 772. Then they cut along the front second opening indicator line 512b, and then continue cutting along the front first opening indicator line 511b to reach one side edge 11b (in this case, the right side). Then, the chuck tape 61 is exposed only in the portion where the upper seal portion 53 has been removed. The effect in this case is the same as in the fourth embodiment.

[0159] In this embodiment, when the user starts cutting the second opening indicator line 512b on the front side, the direction of cutting is downward, making it easier for the worker to apply force to the cutter. Furthermore, both the side edge anti-slip recess 771 and the upper edge anti-slip recess 772 may be provided.

[0160] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0161] <Tenth Embodiment> Figure 13H shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91, the side edge anti-slip recess 771 provided on the front side edge portion 11b in the sixth embodiment is removed, and a new front upper edge anti-slip recess 772 is provided at the position where the upper edge portion 21 and the respective front second opening indicator lines 512b intersect.

[0162] To obtain an opening 56 of the appropriate size for dispensing, the user selects one appropriate front second opening indicator line 512b from the three front second opening indicator lines 512b. When cutting the front second opening indicator line 512b with a cutter, the user first aligns the cutter with the front upper edge anti-slip recess 772 located at the end of the selected front second opening indicator line 512b. Then, the user cuts along the front second opening indicator line 512b, and continues cutting the front first opening indicator line 511b to reach one side edge 11 (in this case, the right side). As a result, only the portion of the upper seal 53 that has been cut off is exposed as the chuck tape 61. The effect in this case is the same as in the fourth embodiment.

[0163] In this embodiment, when cutting the second opening indicator line on the front side is initiated, the direction of cutting is downward, making it easier for the operator to apply force to the cutter. Furthermore, both the side edge anti-slip recess 771 and the upper edge anti-slip recess 772 may be provided.

[0164] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the anti-slip recess 77 and the front opening indicator line 51b, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0165] <Eleventh Embodiment> Figure 13I shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91 has a pair (2 lines) of front second opening indicator lines 512b that extend from the upper edge anti-slip recess 772 provided on the upper edge 21 to the left and right sides. Each front second opening indicator line 512b is connected to a single front first opening indicator line 511b that smoothly crosses the top flap 45. The front first opening indicator line 511b extends between the upper seal portion 53 and the zipper tape 61 from one (here, the right) front side edge 11b to the other (here, the left) front side edge 11b. Side edge anti-slip recesses 771 are provided at each end of the front first opening indicator line 511b.

[0166] In this embodiment, the dispensing opening 56 can be provided on either the left or right side of the resealable paper container 90, whichever is desired. When the user cuts the front opening indicator line 51b with a cutter, they may start cutting from the upper edge anti-slip recess 772 and proceed to either the left or right front side edge 11b. Alternatively, they may start cutting from either the left or right front side edge 11b and proceed to the upper edge anti-slip recess 772. Then, the chuck tape 61 is exposed only in the portion where the upper seal portion 53 has been removed. The effect in this case is the same as in the fourth embodiment.

[0167] In this embodiment, the smallest dispensing opening 56 is obtained by cutting the second opening indicator line 512b on the front surface, and the dispensing opening 56 of the resealable paper container 90 is opened to check how much of the contents can be dispensed. If a larger dispensing opening 56 is desired, the second opening indicator line 512b on the front surface that provides a larger dispensing opening 56 may be cut further. In this way, when two or more upper edge anti-slip recesses 772 and a second opening indicator line 512b on the front surface connected to the upper edge anti-slip recesses 772 are provided on the upper edge portion 21, the appropriate second opening indicator line 512b on the front surface can be selected while checking how much of the contents can be dispensed.

[0168] Furthermore, if the contents are running low and only remain near the bottom of the resealable paper container 90, the user cuts the remaining front first opening indicator line 511b with a cutter, from the side edge anti-slip recess 771 at the end of the front first opening indicator line 511b to the cut front second opening indicator line 512b. Then, the top seal portion 53 is cut off, and the top portion 71 of the resealable paper container 90 opens almost entirely, making it easy to remove the remaining contents.

[0169] If a large amount of contents are to be removed from the initial opening, the contents may be cut from one side edge 11 (the right side in this case) to the other side edge 11 (the left side in this case) without going through the second opening indicator line 512b on the front. The cutting direction may also be the opposite of the above.

[0170] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0171] <Twelfth Embodiment> Figure 13J shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91 has two additional upper edge anti-slip recesses 772, which are provided at the ends of the upper edge second opening indicator lines 512b and which are provided at the ends of the upper edge second opening indicator lines 512b, as provided in the eleventh embodiment.

[0172] To obtain an appropriately sized dispensing opening 56, the user selects one appropriate front second opening indicator line 512b from three pairs (six lines) of front second opening indicator lines 512b, by choosing whether to provide the dispensing opening 56 on either the left or right side of the resealable paper container 90. When cutting the front second opening indicator line 512b with a cutter, the cutter is first aligned with the front upper edge anti-slip recess 772 located at the end of the selected front second opening indicator line 512b. The cutter then cuts along the front second opening indicator line 512b, and then continues to cut the front first opening indicator line 511b, reaching either the left or right front side edge 11b. Only the portion where the upper seal portion 53 has been cut off is exposed as the zipper tape 61. The effect in this case is the same as in the fourth embodiment.

[0173] In this embodiment, when cutting the second opening indicator line on the front side is initiated, the direction of cutting is downward, making it easier for the operator to apply force to the cutter. Furthermore, both the side edge anti-slip recess 771 and the upper edge anti-slip recess 772 may be provided.

[0174] Furthermore, if the contents are running low and only remain near the bottom of the resealable paper container 90, the user cuts the remaining front first opening indicator line 511b with a cutter, from the side edge anti-slip recess 771 at the end of the front first opening indicator line 511b to the cut front second opening indicator line 512b. Then, the top seal portion 53 is cut off, and the top portion 71 of the resealable paper container 90 opens almost entirely, making it easy to remove the remaining contents.

[0175] If a large amount of contents is to be removed from the initial opening, the contents may be cut from one side edge 11 (in this case, the right side) to the other side edge 11 (in this case, the left side) without going through the second opening indicator line 512b on the front. The cutting direction may also be the opposite of the above.

[0176] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0177] <Third Embodiment> Figure 13K shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91 is provided with a third front opening indicator line 513b in addition to the first front opening indicator line 511b provided in the first embodiment. The third front opening indicator line 513b is provided between the zipper tape 61 and the first front horizontal fold line 22b, traversing the top flap 45 from one (in this case, the right) front side edge 11b to the other (in this case, the left) front side edge 11b.

[0178] When the first opening indicator line 511b on the front is cut, the zipper tape 61 is exposed. When repeatedly removing the contents, the zippered paper container 90 is used while opening and closing the zipper tape 61.

[0179] Furthermore, when the contents are nearly depleted, the third opening indicator line 513b on the front is cut, allowing the top 71 of the resealable paper container to open almost entirely, making it easier to remove the contents. Figure 15 shows a resealable paper container 96 with the top flap 45 cut at the third opening indicator line 513b on the front and the resealable tape 61 removed. Since the resealable tape 61 is absent, the unevenness of the resealable tape fitting portion 63 is eliminated, and the contents do not get caught on these unevenness, making it easier to remove the entire contents.

[0180] If the third opening indicator line 513b on the front side were shaped like a perforation or other cut in the paper substrate layer 782, repeated opening of the zipper tape 61 could damage the third opening indicator line 513b on the front side. However, with the third opening indicator line 513b on the front side of this embodiment, the reduction in strength of the laminated sheet 78 is minimal, thus reducing the risk of damage.

[0181] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the presence of the third opening indicator line 513b on the front, is the same as in the first embodiment. The layer configuration of the laminated sheets 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0182] <Fourteenth Embodiment> Figure 13L shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91 is provided with a first front opening indicator line 511b and a second front opening indicator line 512b, as in the fourth embodiment, as well as a third front opening indicator line 513b, similar to that in the thirteenth embodiment.

[0183] When the user cuts the top flap 45 along the first opening indicator line 511b and the second opening indicator line 512b on the front, the upper seal portion 53 is partially left, creating an opening restriction portion 58. Then, only the portion of the upper seal portion 53 that has been cut off is exposed to the zipper tape 61. When the zipper tape 61 is detached and the contents are removed, a limited-sized opening 56 is created for removal. Because the removal opening 56 is of an appropriate size, when the zippered paper container 90 is tilted and the contents are shaken out, an appropriate amount can be removed.

[0184] Furthermore, when the contents are running low, the top flap 45 is cut along the third opening indicator line 513b on the front, allowing the top 71 of the resealable paper container to open almost entirely, making it easier to remove the entire contents. The effect is the same as in the thirteenth embodiment.

[0185] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the presence of the third opening indicator line 513b on the front, is the same as in the first embodiment. The layer configuration of the laminated sheets 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the fourth embodiment.

[0186] <Fifteenth Embodiment> Figure 13M shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91, a side edge anti-slip recess 771 is provided on one side edge 11b (in this case, the right side) of the top flap 45. The starting point of the front opening indicator line 51b is located adjacent to the side edge anti-slip recess 771 in the inward direction of the front blank plate 10b, and the front opening indicator line 51b is in a straight line and reaches the upper edge 21. At that time, it crosses the upper seal portion 53.

[0187] After the user aligns the cutter with the anti-slip recess 771 on the side edge and cuts the top flap 45 along the opening indicator line 51b on the front, a portion of the upper seal portion 53 remains. This remaining portion becomes the opening restriction portion 58. Then, only the portion of the upper seal portion 53 that has been cut off is exposed to the zipper tape 61. When the zipper tape 61 is detached and the contents are removed, a limited-sized removal opening 56 is formed. Because the removal opening 56 is of an appropriate size, when the zippered paper container 90 is tilted and the contents are shaken out, an appropriate amount can be taken out. The size of the opening restriction portion 58, that is, the position where the opening indicator line 51b crosses the upper seal portion 53, is set at a desired position considering the properties of the contents, the amount to be removed, etc.

[0188] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0189] <Sixteenth Embodiment> Figure 13N shows a zippered paper container (flat state) 91 in an intermediate stage of this embodiment, and the blank plate 10 of this embodiment is prepared in the preceding step. In the intermediate stage of this embodiment, the zippered paper container (flat state) 91, a side edge anti-slip recess 771 is provided on the front side edge 11b of one side (in this case, the right side) of the top flap 45. The starting point of the front first opening indicator line 511b is adjacent to the front blank plate 10b in the inward direction at the side edge anti-slip recess 771, and the front first opening indicator line 511b extends laterally, with its end located inside the top flap 45 and inside the front upper overlapping plate 34b. The side edge anti-slip recess 771 and the front first opening indicator line 511b are located in the region sandwiched between the upper seal portion 53 and the zipper tape 61.

[0190] The second front-side opening indicator line 512b begins at the end of the first front-side opening indicator line 511b, starts in a smooth curve, and reaches the upper edge portion 21. At that point, it crosses the upper seal portion 53. An upper edge anti-slip recess 772 is provided at the intersection of the upper edge portion 21 and the second front-side opening indicator line 512b. In Figure 13N, this is the upper edge anti-slip recess 772 on the right.

[0191] Furthermore, a side edge anti-slip recess 771 is provided on the other (in this case, the left) side edge portion 11b. The starting point of the front first opening indicator line 511b is adjacent to the front blank plate 10b in the inward direction at the side edge anti-slip recess 771, and the front first opening indicator line 511b extends laterally, with its end located inside the top flap 45 and inside the front upper overlapping plate 34b. The side edge anti-slip recess 771 and the front first opening indicator line 511b are located in the region sandwiched between the upper seal portion 53 and the chuck tape 61.

[0192] The second front-side opening indicator line 512b begins at the end of the first front-side opening indicator line 511b, starts in a smooth curve, and reaches the upper edge portion 21. At that time, it crosses the upper seal portion 53. An upper edge anti-slip recess 772 is provided at the position where the upper edge portion 21 and the second front-side opening indicator line 512b intersect. In Figure 13N, this is the upper edge anti-slip recess 772 on the left.

[0193] The anti-slip recess 772 on the upper right edge and the anti-slip recess 772 on the upper left edge are located in different positions. The front opening indicator line 51b connected to the upper edge anti-slip recess 772 on the right side extends to the front side edge 11b on the right side, and the front opening indicator line 51b connected to the upper edge anti-slip recess 772 on the left side extends to the front side edge 11b on the left side, and the two front opening indicator lines 51b do not intersect.

[0194] In this embodiment, the shape of the front opening indicator line 51b is a dashed line. Other shapes may include dotted lines, solid lines, double or more lines, etc. Also, various figures, circles, squares, stars, and other patterns or designs connected along the line are also acceptable. The same applies to the front opening indicator line 51b in other embodiments.

[0195] Depending on whether the dispensing opening 56 is located on the left or right side of the resealable paper container 90, the opening indicator line 51b on either the left or right side of the front surface is appropriately selected. The sizes of the dispensing openings 56 on the left and right sides may be the same or different. Furthermore, in this embodiment, the front opening indicator line may be cut from the side edge anti-slip recess 771 or from the upper edge anti-slip recess 772.

[0196] The shape of the zippered paper container (flat state) 91 in the intermediate stage, other than the front opening indicator line 51b and the anti-slip recess 77, is the same as in the first embodiment. The layer configuration of the laminated sheet 78 of the blank plate 10, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0197] <Seventeenth Embodiment of this Disclosure> This embodiment is a paper container 95 without a zipper tape, obtained by removing the zipper tape 61 from the zippered paper container 90 of the first embodiment, as shown in Figure 16. This paper container 95 is obtained by removing the zipper tape 61 from the zippered paper container 90 of the first embodiment shown in Figure 4.

[0198] In the first to twelfth embodiments of the zippered paper container 90 described so far, a zipper tape 61 is provided on the top 71. However, in this disclosure, a paper container without a zipper tape 61 is also possible. The effects of the opening indicator line 51 and the anti-slip recess 77 are the same in each embodiment.

[0199] In this embodiment, although the presence or absence of the chuck tape 61 differs, the shape, material, etc. of the blank plate 10 are the same as in the first embodiment. The manufacturing method is the same as in the first embodiment, except for the chuck tape joining step. [Examples]

[0200] The embodiments of this disclosure will be described in more detail below with reference to examples.

[0201] <Examples> In Example 1, a paper container with a zipper, shown in Figure 4, was manufactured using the blank plate 10 shown in Figures 1A and 1B, which corresponds to this embodiment.

[0202] Two blank plates 10, as shown in Figures 1A and 1B, were prepared and their inner surfaces were aligned and superimposed. As shown in Figure 2, the sealing margins 36 on both opposing side edges were heat-sealed, and the upper sealing portion 53 was also heat-sealed. The zipper tape 61 was also heat-sealed. In this way, an intermediate-stage zippered paper container (flat state) 91 was produced, with the bottom sealing margin 37 not yet sealed.

[0203] The laminated sheet 78 of the blank plate 10 had the following configuration. Figure 14D shows a cross-sectional view of the laminated sheet 78, but the printed layer with the image etc. is not shown. (Outside) Image / design printing layer (gravure printing on the outer surface of paper substrate layer 782) / Paper base layer 782 (base paper for liquid paper containers 150g / m 2 Nippon Paper Industries) / Intermediate adhesive layer 784 (EMAA 20μm Mitsui Dow Polychemicals) N0908N) / Barrier layer 785 (silica vapor-deposited PET 12μm, Dai Nippon Printing) IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40μm, made by Nippon Polyethylene). LC520) (Inside)

[0204] The manufacturing method for the laminated sheet 78 described above will be explained. First, a roll-shaped paper substrate layer 782 is unwound, and predetermined patterns, characters, and opening indicator lines 51 are gravure printed at predetermined positions, and then it is wound up into a roll again. In this embodiment, the opening indicator line 51 is the first opening indicator line 511, and the front blank plate 10b has a front first opening indicator line 511b, while the back blank plate 10a has a back first opening indicator line 511a.

[0205] In the next step, the roll-shaped paper substrate layer 782 described above was unwound, and a barrier layer 785 (silica-deposited PET 12 μm) was laminated to the inner surface of the paper substrate layer 782 by extrusion lamination (sandwich lamination), with a molten intermediate adhesive layer 784 (EMAA 20 μm) interposed in between.

[0206] Next, the innermost thermoplastic resin layer 783 (LDPE 40 μm) was formed on the opposite side (inner surface) of the paper substrate layer 782 of the barrier layer 785 by extrusion lamination, and the material was wound up into a roll again.

[0207] Furthermore, to improve the bonding strength between each bonding layer, anchor coating, corona treatment, flame treatment, etc. may be performed as needed. Alternatively, the molten resin may be treated with ozone.

[0208] Next, the rolled laminated sheet 78 was unwound, and after scribing and die-cutting processes, the blank plate 10 was completed.

[0209] The zipper tape 61, which is heat-sealed and attached to the inner surface of the upper overlapping plate 34 and the top side plate 41 of the zippered paper container 90, has a two-layer structure for the heat-sealed zipper tape body 62, for both the male zipper tape 61m and the female zipper tape 61f. The zipper tape 61 has a resin layer made of LLDPE on the side that is heat-sealed to the zippered paper container 90, and a resin layer made of MDPE on the opposite side. The fitting portions of the male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f are both made of LLDPE, and the width of the zipper tape body portion 62 is 7 mm.

[0210] The dimensions of the back blank plate 10a and the front blank plate 10b are rectangular, measuring 250 mm in length and 189 mm in width. A 7 mm wide side edge seal allowance 36 is provided on both side edges 11 as a seal allowance around the edges. Moreover, at the lower edge 26 of the bottom, a bottom edge seal margin 37 with a width of 10 mm was provided respectively. Also, at the upper edge 21 of the upper overlapping plate 34 and the side plate 41 of the top, a seal margin for the upper seal portion 53 with a width of 3 mm was provided.

[0211] On the blank plate 10, in order from the upper edge 21 in the downward direction, the upper overlapping plate 34, the first horizontal bending line 22, the top plate 33, the second horizontal bending line 23, the wall plate 31, the third horizontal bending line 24, and the bottom plate 35 were provided in this order.

[0212] Also, on the outer sides of both sides of the upper overlapping plate 34, the side plate 41 of the top was provided via the second vertical bending line 13. Further, on the outer sides of both sides of the top plate 33, a top edge protruding margin 38 was provided via the second vertical bending line 13. Also, on the outer sides of both sides of the wall plate 31, the side plate 32 was provided via the second vertical bending line 13. Further, on the outer sides of both sides of the bottom plate 35, a bottom edge protruding margin 43 was provided via the second vertical bending line 13.

[0213] And on the upper overlapping plate 34 and the side plate 41 of the top, when the positions of the inner surfaces of the two blank plates 10 were aligned and overlapped, at a position 6 mm below the upper edge 21 which becomes the upper edge, as shown in FIG. 2, the surface first opening instruction line 511b as the opening instruction means of the container was provided by gravure printing in the transverse direction of the paper container 90 with a chuck.

[0214] Also, below the surface first opening instruction line 511b, the chuck tape 61 was heat-sealed on the inner surface of the top flap 45 in the direction crossing the paper container 90 with a chuck. Here, the interval between the surface first opening instruction line 511b and the chuck tape 61 was 5 mm.

[0215] Furthermore, using the method described above, after joining the two blank plates 10, heat-sealing the chuck tape 61, heat-sealing the side edge seal area 36, ​​and heat-sealing the upper seal area 53, a side edge anti-slip recess 771 is provided on the front side edge 11b to the right of the front first opening indicator line 511b, and an intermediate stage zippered paper container (flat state) 91 is produced in which the bottom seal area 37 is unsealed.

[0216] Next, the mandrel is inserted into the opening of the unsealed bottom sealing area 37 of the intermediate-stage zippered paper container (flat state) 91, leaving the upper overlapping plate 34 in place, and the top plate 33 below it is spread forward and backward by the first horizontal folding line 22, causing the upper overlapping plate 34 to stand upright. An intermediate-stage zippered paper container (folded state) 92 is formed, with a top section 71 made of a top plate 33 below the upper overlapping plate 34, followed by a body section 72 with a roughly rectangular horizontal cross-section (a plane roughly parallel to the bottom surface), and a roughly rectangular opening at the bottom 73. (See Figure 3).

[0217] Then, the overlapping upper overlapping plates 34 were folded towards the back top plate 33a. After that, the top projections 74, which were connected to both the left and right sides of the top section 71, were joined to the body section 72. Hot melt adhesive was used for this joining.

[0218] When the top projection 74 is joined to the body 72, the angle between the top 71 and the top projection 74, via the bent portion 76 of the top projection 74, is bent to approximately a right angle. However, after the top projection 74 is joined to the body 72, the bent portion 76 may become an obtuse angle close to a right angle.

[0219] The bottom 73 of the intermediate-stage resealable paper container (folded box) 92 formed as described above was turned upward, and snack food was filled into it through the opening at the bottom 73. Next, the third horizontal fold line 24 of the lower part of the wall panels 31 on both the front and back sides was folded in a mountain fold.

[0220] At the same time, the third horizontal fold lines 24 on the lower parts of the front and back and left and right side panels 32 were valley-folded. Then, the bottom protrusions 43 on both the left and right sides of the bottom panel 35 had their inner bottom diagonal fold lines 18 mountain-folded, causing them to protrude outwards to the left and right at the lower part of the body 72. Finally, the bottom panels 35 on both the front and back were folded almost perpendicular to the wall panels 31, becoming almost a single flat surface.

[0221] Then, when the fourth transverse fold lines 25 on both the front and back sides were valley-folded, the bottom sealing margin 37 stood upright and took on a flat shape extending in the left-right direction. The inner surface of the front bottom sealing margin 37b and the inner surface of the back bottom sealing margin 37a were then superimposed and heated and pressurized from the outside of the bottom sealing margins 37 on both sides by a heated heater bar. The two were then joined together, sealing the resealable paper container 90 filled with its contents.

[0222] Next, the joined bottom seal portion 37 was tilted backward so that it was closer to the back top panel 33a.

[0223] Next, the bottom protrusion 75 was joined to the bottom plate 35 with hot melt adhesive. The completed, roughly rectangular paper container 90 with a zipper was formed to have dimensions of 95 mm in width, 120 mm in height, and 80 mm in depth. In this way, 200 packages of this zippered paper container 90, filled with snack food, were produced.

[0224] In the example sample, the user was able to cut the top flap 45 along the first opening indicator line 511b on the front side using a cutter, through the side edge anti-slip recess 771 provided on the top side plate 41, thereby cutting off the upper seal portion 53. Next, the user grasped the front opening gripping area 57b between the front opening indicator line 51b and the front zipper tape 61b, and the back opening gripping area 57a between the back opening indicator line 51a and the back zipper tape 61a, with their fingers and spread the zippered paper container outwards. This allowed the zipper tape 61 to be separated, thereby securing a sufficiently large opening 56 for removal.

[0225] As described above, the suitability of the contents to be removed and the resealability of the zippered paper container 90 in the example in which the zipper tape 61 was detached were tested.

[0226] The fastening tape 61 was easily released, opening the top of the resealable paper container 90 over almost its entire width, forming a dispensing opening 56. The snack food filled inside could be easily removed through this dispensing opening 56.

[0227] Furthermore, after removing some of the contents, the resealable paper container 90 of the embodiment was easily resealed by reattaching the zipper tape 61. The remaining contents were then properly stored.

[0228] Furthermore, samples of the resealable paper containers 90 from the second to twelfth embodiments could be prepared using the same laminated sheets 78 and assembly means as in the embodiment. Their external shape was the same as in the embodiment, and the removal and storage of the contents were also good.

[0229] Furthermore, samples of the zippered paper containers 90 of the thirteenth and fourteenth embodiments could be prepared using the same laminated sheets 78 and assembly means as in the embodiment. Their external shape was the same as in the embodiment, and the removal and storage of contents were also good. When the contents were running low and the entire amount needed to be removed, the top flap 45 was cut along the third opening indicator line 513b on the front, which removed the zipper tape 61 and provided a larger opening 56 for removal.

[0230] Furthermore, the paper container 95 without the chuck tape of the fifteenth embodiment was a paper container in which the bonding process of the chuck tape 61 of the chucked paper container 90 of this example was omitted. Other laminated sheets 78, assembling means, etc. were the same as those in the example, and samples could be produced. In this form, after cutting the first opening instruction line, since there is no means to reseal the paper container, it is desirable for applications where the contents are used up in a relatively short period. In addition, since there is no chuck tape 61, the cost of the container can be reduced.

[0231] Also, in the chucked paper container 90 of the present disclosure, the mass ratio of the paper to the total mass of the chucked paper container 90 sufficiently satisfied 51% by mass or more, which is the standard for paper containers.

Explanation of Reference Numerals

[0232] 10 Blank plate 10a Back-side blank plate 10b Front-side blank plate 11 Side edge part 12 First longitudinal folding line 13 Second longitudinal folding line 14 Second longitudinal folding virtual line 15 Top-side protruding part folding line [[ID=二十七]]17 Top-side diagonal folding line 18 Bottom-side diagonal folding line 21 Upper edge part 22 First transverse folding line 23 Second transverse folding line 24 Third transverse folding line 25 Fourth transverse folding line 26 Lower edge part 31 Wall panel 32 Side panel 33 Top panel 34 Upper overlapping plate 35 Bottom panel 36 Side-edge-side seal margin 37 Bottom-side seal margin 38 Top-side protruding part margin 41 Side part plate of the top part 43 Bottom-side protruding part margin 45 Top flap 46 Post-excision apical flap 51 Opening indicator line 511 First opening instruction line 512 Second opening instruction line 513 Third opening instruction line 52 Chuck tape joint 53 Upper seal section 56 Removal opening 57. Opening and gripping fee 58 Opening limiting section 61 Chuck Tape 63 Chuck tape fitting part 71 Top of a resealable paper container 72 Body of a resealable paper container 72d Ridge of the fuselage 73 Bottom of a resealable paper container 74. Top protruding part 76. Folded portion of the protruding top section 77 Anti-slip recesses 771 Side edge anti-slip recess 772 Upper edge anti-slip recess 78 Laminated Sheets 781 Outermost thermoplastic resin layer 782 Paper base layer 783 Innermost thermoplastic resin layer 784 Intermediate adhesive layer 785 Barrier layer 80 Conventional paper containers with zippers 81 Blank Plate 81a Backside blank plate 81b Front blank plate 821 Intermediate horizontal fold line (half-fold line) 831 Wall panel 834 Upper overlapping plate 841 Top side panel 851 Easy-open processed wire 856 Removal opening 857 Opening and gripping fee 861 Chuck Tape 871 Top of resealable paper container 872 Body of a resealable paper container 874 Top protruding part 877 Notch 90. Paper containers with zippers for disclosure. 91. Intermediate stage: Zip-lock paper container (flat state) 92. Intermediate stage: Zip-lock paper container (unfolded) 93. Paper container with zipper closure, with the top seal removed. 94. Paper container with a zipper and an open top. 95 paper containers 96. Zippered paper container with the zipper tape removed. A. Cutting position in an enlarged cross-sectional view of the chuck tape joint. E. First celestial intersection (the intersection of the first vertical fold line and the first horizontal fold line) F. Second celestial intersection (the intersection of the second vertical fold line and the second horizontal fold line) G First bottom intersection (intersection of the first vertical fold line and the fourth horizontal fold line) H Second bottom intersection (intersection of the second vertical fold line and the third horizontal fold line)

Claims

1. In a paper container assembled from a blank plate consisting of a laminated sheet including a paper base layer, The blank plate includes at least a front blank plate and a back blank plate, The paper container has a top section consisting of an upper overlapping plate formed by overlapping and joining the front blank plate and the back blank plate, and a top plate connected to the bottom of the upper overlapping plate, The top side panels are connected to both the left and right sides of the aforementioned upper overlapping plate, The top part has protruding parts on both the left and right sides, The torso is located below the aforementioned top part, The bottom portion located below the aforementioned body, An upper sealing portion provided laterally on the upper edge or near the upper edge of the upper overlapping plate and the side plate of the top portion, Two or more upper edge anti-slip recesses are provided on the upper edge of the upper overlapping plate and / or on the upper edge of the side plate of the top part, A paper container comprising an opening indicator line that starts at the upper edge anti-slip recess or the vicinity of the upper edge anti-slip recess and ends at the side edge of the top side plate.

2. The surface of the paper substrate layer of the laminated sheet at the location where the opening indicator line is provided is flat, according to claim 1. The paper container as described.

3. The opening indicator line includes a second opening indicator line that starts at the upper edge anti-slip recess and ends in the area of ​​the upper overlapping plate, The paper container according to claim 1 or 2, further comprising: a first opening indicator line that starts at the end of the second opening indicator line and ends at the side edge.

4. The paper container according to any one of claims 1 to 3, comprising at least two opening indicator lines, one of which starts from the upper edge anti-slip recess and ends at one of the side edges, and the other opening indicator line ending at the other side edge.

5. The first opening indicator line is a straight line, The paper container according to claim 3 or 4, wherein the second opening indicator line has a curved portion that is in contact with the first opening indicator line, and the radius of curvature of the curved portion is 2 mm or more.

6. The paper container according to any one of claims 1 to 5, wherein the upper edge anti-slip recess is provided at the starting end of at least one of the opening indicator lines, and the side edge anti-slip recess is provided at the end of the side plate of the top part.

7. The paper container according to any one of claims 1 to 6, wherein the anti-slip recess includes a curve that is convex toward the inside of the blank plate.

8. The paper container according to claim 7, wherein the radius of curvature of the curve of the anti-slip recess is 1 mm or more.

9. The paper container according to any one of claims 1 to 8, wherein the anti-slip recess is rectangular in shape, and the two inner corners of the blank plate are curved.

10. The paper container according to claim 9, wherein the radius of curvature of the curve of the anti-slip recess is 0.5 mm or more.

11. In the paper container according to any one of claims 1 to 10, A zippered paper container having a zipper tape extending horizontally on the upper overlapping plate and the top side plate, below the upper sealing portion.

12. A resealable paper container according to claim 11, wherein the opening indicator line is provided above the resealable tape.

13. Below the aforementioned zipper tape, A resealable paper container according to claim 12, comprising a third opening indicator line that starts at the side edge of one side panel of the top and ends at the side edge of the other side panel of the top.

Images